AVIXA Recognized AV Technologist Practice Test

The appropriate time to turn on an audio system's power amplifier is after checking the audio signal level at the mixer, but before making adjustments to the microphone preamplifiers. This sequence is important to prevent any unexpected audible pops or signals from damaging connected speakers when the power amplifier is activated. By checking the audio level in the mixer first, you can ensure that the signal being sent to the amplifier is at an acceptable level, thus avoiding overdriving the amplifier or causing distortion when it is powered on.

The rationale here also relates to best practices in audio signal management to ensure that all elements in the signal chain are properly configured before energizing the power amplifier, which can introduce significant voltage and potential noise into the system. It's crucial to set levels and mitigate the risk of feedback or unexpected loud noises that could cause harm to both the equipment and listeners.

In contrast, turning on the amplifier after adjusting output settings to their maximum or before monitoring levels in the system could lead to very loud and potentially damaging scenarios. Similarly, powering on the amplifier at various stages without confirming adequate signal level may lead to distorted audio output or equipment damage, making it essential to follow proper operational procedures.